Vehicle jack



March 31, 1925.

J. H. BURKHOLDR VEHICLE JACK Filed Nov. l, 1924 5 She'ets-Shee't l a 3cm/AN Ol ///l//l/ I,.-- l-- i, a

March 31. 1925.

` 1,531,733 J. H. BURKHOLDER vsnl CLE JACK Filed NOV. l. 1924 5 Shetgshg'bt 2 lllI//lll//ll/ :FH-Bu RKHOLDER aghi? 'MW March 3l, 1925. 1,531,733

J. H. BuRKHoLDr-:R

VEHI CLE JACK I-iled Nov. l. 1924 3 Sheets'Sh'et 3 gnou/Lto@ J'lIEJURHHoLDER attenua,

Patented Mar. 31, 1925.

UNITED STATES 1,531,733 PATENT orifice.

' JOHN H. BURKHOLDER, OF ASHLAND, OHIO', ASSIGNOB T0 ELITE MANUFACTURING COMPANY, .A FIRM COMPOSED F JOHN H. BURKHOLDER, P. E. COUNTRYMAN,

AND n. L. KILEEFNER, or ASHLAND, omo.`

VEHICLE JACK.

Application led November To all whom t may concern.'

Be it known that I, J oHN H. BURKHOLDER, a citizen of the United States, residing at Ashland, in the county of Ashland and State of Ohio, have invented certain new and useful Improvements in a Vehicle Jack, of which the following is a specification.

My invention relates yto an improvement in vehicle jacks, especially jacks comprising two or more lift screws adapted to be extended to different heights, and in general my object is to simphfy theconstruction of jacks of the type described to permit them to be readily manufactured, and assembled, easily and safely operated, and conveniently handled. Thus the invention involves, among other things, the use of a ,m shown therein, com

hinged folding connection for the extensible parts of the jacks whereby at least one of the parts may be the screws are being operated. As arranged this folding connection limits the extensible movement of they parts and prevents the screws from separating and the jack from collapsing, and it also provides a conven ient. hand grip for the jack adapted to facilitate its handling and placement beneath the vehicle.

In the accompanying a side view, partly in section, embodyin my improvement, with the lift members drawings, Fig; 1 is lly extended. Fig. 2 is a vertical sectional view of the same jack with its parts telescoped together.

Fig. 3 is a vertical section of a known type of screw jack modified and equipped with a; hinged folding connection for the up r lift 'screw accordin to my invention, an Fig. 4 is a side elevatlon of the same jack.

Fig. 5 is a vertical section of another known form of jack embodying my 1mproved folding connection, and 6 is a top view thereof. Fig. 7 is a s1 e v1e w, partly in section, of the jackl shown m Flg. 5 but telescoped andv showing the foldmg elements gripped within a hand as mcarryin or placing the jack in position.

Iow referring to Figs. 1 and 2, the ack rises a hollow stan ard 2 having a latera y extendin arm 3 1n which the o erating shaft 4 of a vel gear 5 is journale A second larger bevel gear 6 is rotatably seated upon the top of standard Qinmeshwithpiniossearmndtubslr prevented from turning while of a jack.

1, 1924. Serial No. 747,850.

' extension 7 integral with or rigidly secured to large gear 6 projects into the hollow standard and rotates freely therein, and this extension -7 and its gear 6 maybe lifted apart from the pinion gear and bodily removed from the standard when the various other parts of the jack are disconnected. A separate screw. member 8 is pinned or otherwise secured centrally tothe base 9 of the standard and extends upwardly apart from the walls thereof. A sleeve member 10 having right and left screw-threads, internally and externally, is revolubly engaged with fixed screw 8, and a pair of laterally-extending lugs 12 at the lower end of sleeve 10 slide vertically in correspondingly situated longitudinal channels 14 in the inner wall of the rotatableextension 7 which depends from gear 6. Consequently, when the bevel gears rotate extension 7, screw or sleeve 10 is also rotated and moves upwardly ,or downwardly on stationary screw 8 depending upon the direction of rotation of the operating gears. In order to increase the lifting range of the jack, a second lift screw 15 is sleeved in screw-threaded engagement with inner screw sleeve 10, and tubular extension 7 is of suflicient diameter to receive upper lift screw 15 when the parts are telescoped together. The f ber is prevented from rotatingl during the rotation of inner screw sleeve 10 and outerextension 7 no. differential movement between the screws will occur. Of course when the standard is resting on the ground and the upper lift screw 15 is engaged with an object, such as the axle-of a vehicle, the 'part 15 is held against rotation, but it is also true that lift screw 15 must be raised more or less vin the first instance to bring about such an engaging and working relation. To prevent independent rotation of upper lift screw 15 and to obtain a constant working relation between the two lift screws I provide a pair of hinged elements 16. and 17, respectively, and pivotally connect one of them to ears 18 at one side of the enlargement or top rest 19 of upper lift screw 15, and hin e the other toprojections 20 integral with t e upper end of standard 2. The hinge'joint between the two folding elements 16 and 17 may be s hwldered wint Shown 111 F1a 1 to prevent the parts from buckling too far inward, but in any event when the two movable lift screws are raised and separated a definite distance the hinged elements will check their movements and prevent the screw members from separating and the jack from collapsing under4 a load. When these folding elements are folded "or unfolded the operator may readily grasp them and carry the jack around or set it or move it from place to place. Only a single pair of hinged connecting elements are shown in the present device, but it is obvious that two sets of such devices may be attached on opposite sides of the standard if any advantage may be thereby gained. In some instances the folding connection may be diametrically opposite the operating shaft; in others it may be on the same side as the operating shaft, or projected at any other angle or side of the standard. j

The utility of similar folding elements in known types of double-screw jacks is shown in Figs. 3 to 7. Thus, in Figs. 3 and 4 I show a lift screw 21 operating in a hollow standard 22 having a screw-thread 23 `in its upper end. A second lift screw 24 is screw-engaged and telescopically connected with the upper end of lower screw 21. A

bevel gear 25 carried by screw 21 meshes with an operating pinion 26 journaled in one arm 27 of a yoke member and sleeve 27 which is slidably engaged with standard 22y and prevented from turning by lugs 28 on the standard. A cover plate 29 confines gear 25 within the upper yoke portion of sleeve 27, and it should be noted that the gears and operating mechanism must necessarily rise and fall with screw 21. In this tipe of double screw jack it is also desirable t at rotation of the upper lift screw 24 be prevented, and this result may be readily accomplished with all the advantages hereinbefore described by attaching a set of folding links 16 and 17 to the top rest 19 of upperscrew 24 and to cover plate 29 substantiallgl as delineated. .In another known jack em odying two lift screws, see Figs. 5 to 7, the' operating gearing 30 is mounted upon the upper lift screw 31, and the hous- 1ng 32 for such gearing contains an operating wormfand shaft 33 to which an operatin handle is connected, the handle being eit er a detachable or permanently connected part, not shown in the drawing. In operating a jack of this type the handle is relied on to prevent independent rotation j of the ear housing, but it will be seen that in app ying power at the highest point of the jack through an independentl rotatable gear housin the stabillty of the jack is easily distured made diiicult. To overcome 4the objections 1n part, a pair of ed links 16" and 17" may be connected to ousing 3.2 carried by and its setting and handling upper screw 31 and to the top of standard 34 inwhich the lower screw 35 operates.

What I believe to be new and novel'and desire to claim, is:

1. A vehicle jack having a set of extensible screw and lift members, and means adapted to prevent at least one of said members from rotating while another is operating, comprising folding links secured to one member and another part of said jack.

2. A vehicle jack having telescopic screws and operating means for said screws, and a pair of hinged links connected to one of said screws and a non-rotatable part of said jack ada ted to fold and unfold in operating sai jack. O

3. A vehicle jack havingmovably-related Y parts comprisin extensible screws and a supporting stan ard means carried by one of said parts adapted torotate one of said screws, and a pair of hinged links connecting movably-related part's of the jack adapted to prevent rotation thereof when said screw is rotated.

4. A vehicle jack, comprising a standard, a pair of extensible screws telescopically related to said standard, operating means for said screws carried by one of said parts, and a pair of hinged elements connecting relative y fixed and movable parts of said jack and foldable and unfoldable at one side of said standard. e

5. A vehicle jack, comprising a standard, a pair of telescopic lift screws connected to operate to ether and jointly .supported upon said .stan ard, means connected with one screw adapted to rotate thevsame and therethrough raise and lower the second screw, and means adapted to prevent the rotation -of the second screw comprising a pair of of said parts adapted to operate said lift screws, and a pair of foldable links connecting the upper end of one of said screws with a non-rotatable part of said jack.

7. A vehicle jack, comprising a standard, separate upper and lower lift 'screws telescopicall mounted within said standard, means a apted to rotate one of said screws, and a pair of foldable links connectin the upper ends of a pair of the movably-re ated parts of the jack. o

8. A vehicle jack, comprising a hollow standard having a fixed screw therein, a double-screw threaded sleeve engaged with said fixed screw, a second lift screw enga ed with said sleeve, and a rotatable driving member surrounding said fixed screw having operable connection with said sleeve adapted to permit said sleeve to berotated and elevated and lowered within said standard.

9. A vehicle jack, comprising a hollow standard having an upright screw centrally fixed therein, a sleeve screw-threaded internally and externally engaged with said fixed Screw, a second lift screw sleevedyin screw-engagement with said sleeve, a driving member for said sleeve rotatably supported upon said standard, and means adapted to prevent said second lift'screw from rotating while said sleeve is being rotated.

10. A Vehicle jack, comprising a fixed vertical Screw, a sleeve having inner screwthreads engaged with said screw and formed with outer screw-threads, a second lift member screw-connected with said sleeve and a rotatable gear having a depending driving part o posite said fixed screw adapted to be slidab engaged with said sleeve.

11. vehicle ack, comprising a' xed vertical screw, la sleeve having inner screwthreads engaged with said screw and formed with outer screw-threads, a second lift member screw-connected with said sleeve, a rotatable gear having a depending driving part o positesaid xed screw adapted tol be slidab y en aged with said sleeve and a pair of hinged inks adapted to prevent the second lift member from rotating while Said sleeve is being driven.

In testimony whereof I alix my signature.

JOHN H. BURKHOLDER. 

